Question

the nation’s air industry experienced rapid growth soon after the
start of the world war i.
introduction of passenger jets.
wright brothers flew the first plane.
opening of hartsfield-jackson international airport.

Explanation:

To determine when the nation’s air industry experienced rapid growth, we analyze each option:

• "Start of World War I": WWI (1914) spurred air industry growth for military use, leading to tech advances and later civilian growth.
• "Introduction of passenger jets": Jets (post - WWII) were a later development, not the initial rapid growth trigger.
• "Wright brothers flew the first plane": Their 1903 flight was the start, not rapid growth.
• "Opening of Hartsfield - Jackson Airport": This is a specific airport, not an industry - wide growth trigger.

WWI’s demand for airpower (military planes, training, infrastructure) led to rapid industry expansion.

Answer:

A. start of the World War I